Author: (Baker) Prain
Morphological description
Tree 18-33 m high and 31-95 cm in diameter; buttresses 60 cm high and spread. Stipules caducous, not seen.
Leaves (coriacea Sindora BBGB18f5 ) paripinnate, 3 or 4-jugate; petiole (1.5-)2.5-4 cm and rachis 5.5-10(-14) cm long, glabrous; petiolules very short, up to c. 5 mm, glabrous. Leaflets coriaceous, elliptic, ovate, or slightly obovate, (3.5-)5-10(-15) by (2-)3-5(-7.5) cm; apex shortly acuminate or acuminate, rarely rotund or retuse; base acute, cuneate, obtuse, or rotundate, sometimes unequally sided and often almost glabrous on both surfaces (coriacea Sindora lf/bud FT25 ).
Inflorescences paniculate, up to 20(-30) cm long, lateral branches up to 7 cm long, both rachis and branches densely puberulous; bracts and bracteoles ovate or lanceolate, 1.5-3 mm long, densely puberulous; pedicels 1-2.5 mm, densely puberulous.
Flowers (coriacea Sind fl BBGB18f5 ) yellow, fragrant. Calyx lobes 4, elliptic or lanceolate, 6.5-7.5 by 2.5-3 mm, outside densely puberulous and without spiny outgrowths, densely appressed hairy inside. Petal 1, slightly obovate-oblong, 6.5-7.5 by 3-3.5 mm; outside densely puberulous; inside glabrous except margin villose. Stamens: 10 (9+1), united basal parts of the filaments c. 2 mm high; free filaments and staminodes up to c. 12 mm, sparsely hairy often at the lower part or at base, or glabrous; 2 largest anthers ellipsoid, c. 3.5 mm long, the others smaller, up to 1.5 mm long. Ovary subsessile, slightly ellipsoid, c. 4 mm long, densely woolly along the suture, 4- or 5-ovuled; style up to c. 10 mm, glabrous; stigma small.
Pods (young) ellipsoid or slightly broadly elliptoid, 7-10 by 4-6 cm, flattened, often unequally sided, slightly minutely hairy, faintly veined, unarmed, beak slightly curved, c. 8 mm.
Seeds 2 or 3, arillate.
Distribution
Thailand (Peninsula); Malesia: Sumatra (E Coast), Malay Peninsula (widespread), Borneo (Sabah, Kalimantan).
Habitat & Ecology
In forests at low altitudes, favouring non-inundated sandy or leached soils. Flowering from March-September; fruiting throughout the year.
Note
The glabrous leaves and unarmed pods are characteristic for plants of the present species.